NATIJEE AND VALUE OF THE EVIDENCE. 
299 
drift deposits, there is little difficulty in distinguishing between the fresh and uniform 
appearance of undisturbed beds, and the mixed and confused make of made ground, 
independently of the occurrence of any charred materials, pottery, &c., and of bones in 
a comparatively fresh condition. The lines of original stratification once broken cannot 
be so restored as not to show the break of continuity. In the St. Acheul pits, the several 
divisions of the gravelly clay, h (figs. 5, 6, 7, 10, 11), and the two of the underlying 
sands and gravel, c, d, each present distinct divisional lines and ditferences in colour. 
Now these lines and this bedding continue uninterruptedly over the portion of the 
lower gravel where the flint-implements are found. There is no break, no disturbance, 
and the small delicate fossils in the sand c remain uninjured, except at such places where 
the ground has been dug for brick-earth or otherwise excavated, and then the disturb- 
ance is sufficiently apparent. At St. Acheul part of the field was occupied for several 
centuries as a Gallo-Eoman burying ground. But the old sepultures rarely extend 
deeper than the brick-earth and gravel, b. Some fine specimens of stone coffins (of the 
hard and sandy lower chalk) remain on the ground, the surrounding brick-earth having 
been excavated. Of the wooden coffins nothing but the ironwork remains. Roman 
coins, and fragments of old pottery are found on or near the surface, and the new 
ground is, in places, strewed with human bones. The following sections in F. Feeville’s 
pits, show how distinct the line is between the disturbed and undisturbed ground. 
Sections in the pits near the high road at St. Acheul.. 
Fig, 10. Fig. 11, 
N. S. W. E. 
Fig. 10. Fig. 11. 
ft. in. ft. in. 
a. Surface soil; — a. Made ground and graves (7^ feet and 9^ feet) with human bones 0 6 0 6 
h. Brown sandy clay and angular gravel ; the lower bed (h 4 ) is almost wanting 6 0 6 6 
c. Whitish sandy marl with yellow seams : few shells : contorted lamination 6 0 5 6 
d. White gravel, irregular and contorted. For details of the composition of these beds, see description 
of figs. 5 and 6, pp. 289, 290. There are more hones and teeth, and fewer flint-implements, here than in 
the pits nearer the Cagny road. 
At Menchecourt I found the ground distnrbed in one spot to a depth of 6 feet, but 
everywhere else it was undisturbed beyond a depth of 1 to 2 feet. In no case did I 
